CN110595095A - Air conditioning system and control method - Google Patents
Air conditioning system and control method Download PDFInfo
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- CN110595095A CN110595095A CN201910951077.XA CN201910951077A CN110595095A CN 110595095 A CN110595095 A CN 110595095A CN 201910951077 A CN201910951077 A CN 201910951077A CN 110595095 A CN110595095 A CN 110595095A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compressor (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides an air conditioning system and a control method, the air conditioning system comprises: the air conditioning system comprises a compressor (1), an evaporator (2), a condenser (3) and a throttling device (4), and further comprises a first four-way valve (5), wherein one of two connecting ends of the first four-way valve (5) is communicated with an air suction port of the compressor (1), the other connecting end of the first four-way valve is communicated with an air exhaust port of the compressor (1), and the first four-way valve (5) can be controlled to communicate the two connecting ends after the air conditioning system is stopped, so that the air suction port of the compressor (1) is communicated with the air exhaust port. The two ends are communicated after the air conditioning system is controlled to be stopped by the invention, so that the air suction port and the air exhaust port of the compressor are effectively communicated, the connection between the compressor and an external pipeline is closed, the refrigerant is prevented from continuously migrating into the compressor, the condition that the insulation resistance value is too low when the air conditioning system is started is avoided, and the system failure rate is reduced.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning system and a control method.
Background
The compressor of the common split air conditioner is vertical, the plug wire terminal of the charged body and the motor in the compressor are positioned at the top of the compressor, and the insulation resistance of the system can be ensured to meet the requirement as long as the whole machine is well grounded.
However, for air conditioning systems such as bus air conditioners, car air conditioners, etc. and air conditioning systems that must use horizontal compressors, the refrigerant of the air conditioning system migrates into the compressor, submerging the live and exposed winding plug terminals, winding welding points, etc. in the compressor. When the system is powered on, the charged bodies exposed in the compressor are in short circuit with the inner wall of the shell of the compressor through the liquid refrigerant, and the short circuit shows that the insulation resistance value is too low when the whole compressor is powered on, the insulation resistance value far reaches the national standard requirement, and the system reports insulation faults and even cannot be powered on.
The scheme has at present to adopt insulating flange or insulation board to insulate between compressor and air conditioner pipe network and the mounting panel, but to the violent vibrations of automobile-used process companion, this installation of insulating flange is on the compressor suction and exhaust pipe, has the leakage hidden danger (insulating flange leads to its linkage segment pipeline to break easily on the one hand, and on the other hand time has been of a specified duration insulating flange self fatigue and has revealed). And a liquid storage tank is additionally arranged behind the evaporator to reduce the migration volume of liquid refrigerant in the compressor and reduce the insulation resistance value of the compressor, for example, the patent CN205279524U, but the structure of the liquid storage tank only can reduce the migration volume of refrigerant in the compressor but cannot avoid the migration of refrigerant, and the arrangement of the liquid storage tank increases the cost greatly.
The invention discloses an air conditioning system and a control method, which are researched and designed in the prior art, because the horizontal compressor air conditioner has the technical problems that after the air conditioning system is stopped, a refrigerant migrates into a compressor, electrified and exposed winding plug wire terminals, winding welding spots and other parts in the compressor are submerged, so that an electrified body is in short circuit with the inner wall of a shell of the compressor through a liquid refrigerant, the insulation resistance value is too low when the whole compressor is started, the national standard requirement cannot be met, the system reports insulation faults, even the compressor cannot be started, and the like.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that in the prior art, particularly in a horizontal compressor air conditioner, after the compressor is stopped, a refrigerant migrates into the compressor to submerge the electrified and exposed winding plug wire terminal, winding welding spot and other parts in the compressor, so that the insulation resistance value is too low when the whole machine is started, thereby providing an air conditioning system and a control method.
The present invention provides an air conditioning system, comprising:
the air-conditioning system comprises a compressor, an evaporator, a condenser and a throttling device, and further comprises a first four-way valve, wherein one of two connecting ends of the first four-way valve is communicated with an air suction port of the compressor, the other connecting end of the first four-way valve is communicated with an air exhaust port of the compressor, and the first four-way valve can be controlled to communicate the two connecting ends after the air-conditioning system is shut down, so that the air suction port of the compressor is communicated with the air exhaust port of the compressor.
Preferably, the first and second electrodes are formed of a metal,
the two connection ends of the first four-way valve are a first end and a fourth end, wherein the first end is communicated with an air suction port of the compressor, and the fourth end is communicated with an air exhaust port of the compressor.
Preferably, the first and second electrodes are formed of a metal,
the first four-way valve also comprises a second end and a third end;
still include the second cross valve, the second cross valve includes four link ends: a fifth end, a sixth end, a seventh end and an eighth end, wherein the fifth end is communicated with the third end of the first four-way valve, the sixth end is communicated with the condenser, the seventh end is communicated with the second end of the first four-way valve, and the eighth end is communicated with the evaporator;
when the air conditioning system is started, the first four-way valve can be controlled to enable the fourth end and the third end to be communicated and the first end and the second end to be communicated, so that exhaust air of a compressor is led out to the condenser through the first four-way valve and the second four-way valve, and meanwhile, outlet air of the evaporator is led to an air suction port of the compressor through the second four-way valve and the first four-way valve;
when the air conditioning system is stopped, the first four-way valve can be controlled to enable the fourth end to be communicated with the first end, and enable the second end to be communicated with the third end, so that the exhaust air and the suction air of the compressor are communicated, and the suction air and the exhaust air are closed.
Preferably, the first and second electrodes are formed of a metal,
and the gas-liquid separator is arranged between the second end of the first four-way valve and the seventh end of the second four-way valve.
Preferably, the first and second electrodes are formed of a metal,
the throttling device is connected to a pipeline between the condenser and the evaporator.
Preferably, the first and second electrodes are formed of a metal,
the throttling device is an electronic expansion valve.
Preferably, the first and second electrodes are formed of a metal,
the compressor is a horizontal compressor.
The invention also provides a control method of the air conditioning system, which uses the air conditioning system, and controls the first four-way valve to control the refrigerant not to migrate into the compressor when the air conditioning system is closed.
Preferably, the first and second electrodes are formed of a metal,
when the first four-way valve comprises a first end, a fourth end, a second end and a third end:
when the air conditioning system is closed, controlling the first four-way valve to enable the fourth end to be communicated with the first end and simultaneously enable the second end to be communicated with the third end;
and when the air conditioning system is opened, controlling the first four-way valve to enable the fourth end to be communicated with the third end, and simultaneously enabling the first end to be communicated with the second end.
The air conditioning system and the control method provided by the invention have the following beneficial effects:
the invention sets the first four-way valve at the air suction port and the air exhaust port of the compressor, to make two ends of the first four-way valve respectively connected to the air suction port and the air exhaust port of the compressor, and control the two ends to be communicated after the air conditioning system is shut down, so as to make the air suction port and the air exhaust port of the compressor effectively communicated, thereby closing the connection between the compressor and the external pipeline, controlling the closing of the air suction and exhaust, effectively preventing the refrigerants in the condenser, the evaporator, the gas-liquid separator and other structures from continuously migrating into the compressor after the air conditioning system is shut down, and causing the erosion of the parts such as the charged body in the compressor, preventing the over-low insulation resistance value when the air conditioning system is started, reducing the failure rate of the system reporting insulation failure, and ensuring the safe. The invention has simple structure and is easy to realize. The insulation resistance of the compressor system is greatly improved, and the compressor system is low in cost and reliable. The air conditioner can greatly expand the application range of air conditioner products, and particularly is applicable to the field with high requirements on the insulation resistance of an air conditioner system.
Drawings
Fig. 1 is a system diagram of an air conditioning system having a high insulation resistance value according to the present invention in normal operation;
fig. 2 is a system diagram of the air conditioning system with a high insulation resistance value according to the present invention when it is stopped.
The reference numbers in the figures denote:
1. a compressor; 2. an evaporator; 3. a condenser; 4. a throttling device; 5. a first four-way valve; 6. a second four-way valve; 7. a gas-liquid separator; A. a first end; B. a second end; C. a third end; D. a fourth end; E. a fifth end; F. a sixth terminal; G. a seventh terminal; H. and an eighth end.
Detailed Description
As shown in fig. 1-2, the present invention provides an air conditioning system, comprising:
the air conditioning system comprises a compressor 1, an evaporator 2, a condenser 3 and a throttling device 4, and further comprises a first four-way valve 5, wherein one of two connecting ends of the first four-way valve 5 is communicated with an air suction port of the compressor 1, the other connecting end of the first four-way valve 5 is communicated with an air exhaust port of the compressor 1, and the first four-way valve 5 can be controlled to communicate the two connecting ends after the air conditioning system is shut down, so that the air suction port of the compressor 1 is communicated with the air exhaust port.
The invention sets the first four-way valve at the air suction port and the air exhaust port of the compressor, to make two ends of the first four-way valve respectively connected to the air suction port and the air exhaust port of the compressor, and control the two ends to be communicated after the air conditioning system is shut down, so as to make the air suction port and the air exhaust port of the compressor effectively communicated, thereby closing the connection between the compressor and the external pipeline, controlling the closing of the air suction and exhaust, effectively preventing the refrigerants in the condenser, the evaporator, the gas-liquid separator and other structures from continuously migrating into the compressor after the air conditioning system is shut down, and causing the erosion of the parts such as the charged body in the compressor, preventing the over-low insulation resistance value when the air conditioning system is started, reducing the failure rate of the system reporting insulation failure, and ensuring the safe. The invention has simple structure and is easy to realize. The insulation resistance of the compressor system is greatly improved, and the compressor system is low in cost and reliable. The air conditioner can greatly expand the application range of air conditioner products, and particularly is applicable to the field with high requirements on the insulation resistance of an air conditioner system.
According to research and measurement, the resistivity of the gaseous refrigerant is over 500M omega cm, and the resistivity of the liquid refrigerant is mostly under 20M omega cm. Therefore, the invention can prevent the liquid refrigerant from transferring to the compressor after the system is shut down by controlling the refrigerant circulation of the air conditioning system, thereby fundamentally and greatly improving the insulation resistance of the compressor.
Preferably, the first and second electrodes are formed of a metal,
the two connection ends of the first four-way valve 5 are a first end a and a fourth end D, wherein the first end a is communicated with the suction port of the compressor 1, and the fourth end D is communicated with the exhaust port of the compressor 1. The first end of the first four-way valve is communicated with the suction port of the compressor, the fourth end of the first four-way valve is communicated with the exhaust port of the compressor, namely the suction and exhaust of the compressor can be effectively controlled to be closed and communicated with the outside by controlling the first end and the fourth end of the first four-way valve after the compressor is stopped, and therefore, the refrigerant is effectively prevented from migrating into the compressor.
The four-way valve is added to the air suction and exhaust port of the compressor of the air conditioning system to control the refrigerant to migrate to the compressor after the system is stopped, so that the insulation resistance of the compressor is improved, and the insulation resistance of the whole machine is improved. The invention has simple structure and is easy to realize. The insulation resistance of the compressor system is greatly improved, and the compressor system is low in cost and reliable. The air conditioner can greatly expand the application range of air conditioner products, and particularly is applicable to the field with high requirements on the insulation resistance of an air conditioner system.
Preferably, the first and second electrodes are formed of a metal,
the first four-way valve 5 further comprises a second end B and a third end C;
still include second cross valve 6, second cross valve 6 includes four link ends: a fifth end E, a sixth end F, a seventh end G and an eighth end H, wherein the fifth end E is communicated with the third end C of the first four-way valve 5, the sixth end F is communicated with the condenser 3, the seventh end G is communicated with the second end B of the first four-way valve 5, and the eighth end H is communicated with the evaporator 2;
when the air conditioning system is started, the first four-way valve 5 can be controlled to enable the fourth end D and the third end C to be communicated and enable the first end A and the second end B to be communicated, so that exhaust gas of a compressor is led out to the condenser through the first four-way valve 5 and the second four-way valve 6, and meanwhile, outlet gas of the evaporator is led to a suction port of the compressor through the second four-way valve 6 and the first four-way valve 5;
when the air conditioning system is stopped, the first four-way valve 5 can be controlled to communicate the fourth end D with the first end a and communicate the second end B with the third end C to communicate the discharge air and the suction air of the compressor and to close the suction air and the discharge air. The second four-way valve is arranged to switch and control the refrigeration mode and the heating mode of the air conditioning system, and the control purposes of normally running the air conditioner during starting and controlling the compressor to be closed and preventing external refrigerants from entering the compressor can be achieved through the optimal communication control mode between the first four-way valve and the second four-way valve, so that the insulation resistance value is improved, and short circuit is prevented.
1. A double four-way valve air conditioning system, one four-way valve is used as a switching device for cooling or heating of the air conditioning system, and the other four-way valve can control the separation and connection of a compressor and the air conditioning system. The four-way valve has no internal leakage when low pressure difference is required.
2. When the air conditioning system is shut down, the separation of the compressor and the air conditioning pipeline system is realized by controlling the four-way valve, so that refrigerant in the system is prevented from migrating into the compressor, and the insulation resistance value of the compressor is improved.
Preferably, the first and second electrodes are formed of a metal,
and the gas-liquid separator 7, wherein the gas-liquid separator 7 is arranged between the second end B of the first four-way valve 5 and the seventh end G of the second four-way valve 6. The gas-liquid separator can perform gas-liquid separation on the refrigerant entering the suction pipeline of the compressor, so that the refrigerant entering the compressor is prevented from being in a liquid state, and the liquid impact and other conditions are avoided.
Preferably, the first and second electrodes are formed of a metal,
the throttle device 4 is connected to a line between the condenser 3 and the evaporator 2. The throttling device can throttle and reduce the pressure of the refrigerant passing through the condenser, so as to provide conditions for the refrigerant to enter the evaporator.
Preferably, the first and second electrodes are formed of a metal,
the throttling device 4 is an electronic expansion valve. This is a preferred form of construction of the throttling device of the present invention to provide precise control of the flow of refrigerant in the refrigerant line.
Preferably, the first and second electrodes are formed of a metal,
the compressor 1 is a horizontal compressor. The compressor is a preferred structure form of the compressor, the probability of a horizontal compressor that a refrigerant submerges electrified parts such as a motor rotor and a stator is high, the probability of a short circuit and a high starting insulation resistance value is high, the compressor is not limited to the horizontal compressor, the compressor is also suitable for a vertical compressor, the vertical compressor also has a refrigerant migration phenomenon, but due to the fact that the device position of the compressor is in direct contact with the ground and the ground is reliable, most of vertical compressor plug wire boxes are located on the top of the compressor, the position is high, and the influence of refrigerant migration is small.
The invention also provides a control method of the air conditioning system, which uses the air conditioning system with high insulation resistance value, and controls the first four-way valve to prevent the refrigerant from migrating into the compressor when the air conditioning system is closed.
The invention sets the first four-way valve at the air suction port and the air exhaust port of the compressor, to make two ends of the first four-way valve respectively connected to the air suction port and the air exhaust port of the compressor, and control the two ends to be communicated after the air conditioning system is shut down, so as to make the air suction port and the air exhaust port of the compressor effectively communicated, thereby closing the connection between the compressor and the external pipeline, controlling the closing of the air suction and exhaust, effectively preventing the refrigerants in the condenser, the evaporator, the gas-liquid separator and other structures from continuously migrating into the compressor after the air conditioning system is shut down, and causing the erosion of the parts such as the charged body in the compressor, preventing the over-low insulation resistance value when the air conditioning system is started, reducing the failure rate of the system reporting insulation failure, and ensuring the safe. The invention has simple structure and is easy to realize. The insulation resistance of the compressor system is greatly improved, and the compressor system is low in cost and reliable. The air conditioner can greatly expand the application range of air conditioner products, and particularly is applicable to the field with high requirements on the insulation resistance of an air conditioner system.
Preferably, the first and second electrodes are formed of a metal,
when the first four-way valve comprises a first end A, a fourth end D, a second end B and a third end C:
when the air conditioning system is closed, controlling the first four-way valve to enable the fourth end D to be communicated with the first end A, and simultaneously enabling the second end B to be communicated with the third end C;
when the air conditioning system is turned on, the first four-way valve is controlled to enable the fourth end D and the third end C to be communicated, and meanwhile, the first end A and the second end B to be communicated.
The optimal control mode for preventing the shutdown refrigerant of the air conditioning system from entering the compressor is provided, namely the fourth end D and the first end A of the first four-way valve are controlled to be communicated when the air conditioner is shut down, and the second end B and the third end C are simultaneously controlled to be communicated, so that the refrigerant can be effectively controlled and prevented from entering the compressor through an air suction pipeline and an exhaust pipeline, particularly the air suction pipeline, and the condition that the insulation resistance value is high because the refrigerant enters the compressor after the air conditioning system is shut down is prevented; when the air conditioner is opened, the fourth end D and the third end C are controlled to be communicated, and meanwhile, the first end A and the second end B are communicated, so that the normal flowing of a refrigerant in a pipeline of the air conditioning system can be controlled, and the normal operation of the air conditioning system can be maintained.
The technical scheme of the invention greatly improves the insulation resistance of the compressor and even the whole air conditioner by solving the problem of low insulation resistance of the compressor, particularly the horizontal compressor.
The invention utilizes the four-way valve body to control the on and off of the compressor loop. When the air conditioner is shut down, the relevant valve body is powered off, the compressor is divided into a single part from the air conditioning system, the refrigerant in the system is not communicated with the compressor, and the refrigerant in the system cannot migrate into the compressor. The insulation resistance of the compressor is obviously improved (by more than 20 times).
The technical effects are as follows: the connection and separation of the compressor and the air conditioning system are realized by controlling the related valve bodies, and the insulation resistance value of the compressor and even the whole machine after the system is shut down can be greatly improved. The problems that the insulation resistance value of the compressor, particularly a horizontal compressor air conditioning system, suddenly drops due to the migration of a refrigerant after standing for a long time, and the system cannot be started due to insulation failure reporting and the like can be effectively solved. The scheme fundamentally solves the problem that the insulation resistance value does not meet the standard, and the insulation resistance value is simple in structure, reliable, low in cost and easy to realize.
1. The compressor system with high insulation resistance value comprises a compressor, a first four-way valve 5, a second four-way valve 6, a condenser, a throttle valve, an evaporator, a gas-distributing three-way valve and the like, and the compressor is separated from the system after shutdown by controlling the four-way valve to be switched in a power-off reversing way. The refrigerant is prevented from migrating to the interior of the compressor, so that a large amount of liquid refrigerant is accumulated in the compressor, and the insulation resistance value of the compressor and even an air conditioning system is prevented from suddenly dropping.
2. When the system normally operates, the first four-way valve 5 is powered on, the AB is conducted, the CD is conducted, the compression molding machine is connected into the air conditioning system, and the second four-way valve 6 controls the working mode of the system to be heating or refrigerating according to requirements. As shown in fig. 1, when the system is operating normally, the refrigerant is discharged from the compressor discharge pipe, sequentially flows through the DC of the first four-way valve 5, the EF of the second four-way valve 6, then passes through the condenser, the throttle valve, the evaporator, sequentially flows through the HG of the second four-way valve 6, the air separator, and the BA of the first four-way valve 5, and then returns to the compressor, thereby completing a cycle.
3. After the system is shut down, the first four-way valve 5 is powered off, and the AD and the BC are conducted to separate the compressor from the air conditioning system. As shown in fig. 2, after the system is shut down, the compressor discharge pipe is connected to the compressor suction pipe through DA of the first four-way valve 5 to form a closed loop. The air is connected to the second four-way valve 6 to form a circuit for discharging the compressor to the outside.
After the system is stopped, the first four-way valve 5 is powered off, and the compressor and the air conditioning system are instantaneously separated. Because the refrigerant inside the compressor is gaseous during working, the compressor is divided into independent parts after being stopped and is not communicated with the refrigerating system, the refrigerant of the refrigerating system cannot migrate to the compressor, and the liquid refrigerant cannot exist inside the compressor. The live bare conductors such as the inner winding of the compressor, the plug wire terminal and the like are communicated with the components such as the shell of the compressor, the stator and the like through gaseous refrigerant. The gas refrigerant resistivity is 500M Ω cm or more, and the liquid refrigerant resistivity is 20M Ω cm or less in many cases. Therefore, the invention can increase the insulation resistance value of the compressor by more than 20 times, and can completely meet the requirements of different users.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. An air conditioning system characterized by: the method comprises the following steps:
the air conditioning system comprises a compressor (1), an evaporator (2), a condenser (3) and a throttling device (4), and further comprises a first four-way valve (5), wherein one of two connecting ends of the first four-way valve (5) is communicated with an air suction port of the compressor (1), the other connecting end of the first four-way valve is communicated with an air exhaust port of the compressor (1), and the first four-way valve (5) can be controlled to communicate the two connecting ends after the air conditioning system is stopped, so that the air suction port of the compressor (1) is communicated with the air exhaust port.
2. The air conditioning system of claim 1, wherein:
the two connecting ends of the first four-way valve (5) are a first end (A) and a fourth end (D), wherein the first end (A) is communicated with an air suction port of the compressor (1), and the fourth end (D) is communicated with an air exhaust port of the compressor (1).
3. The air conditioning system of claim 2, wherein:
the first four-way valve (5) also comprises a second end (B) and a third end (C);
still include second cross valve (6), second cross valve (6) include four link ends: a fifth end (E) communicated with the third end (C) of the first four-way valve (5), a sixth end (F) communicated with the condenser (3), a seventh end (G) communicated with the second end (B) of the first four-way valve (5), and an eighth end (H) communicated with the evaporator (2);
when the air conditioning system is started, the first four-way valve (5) can be controlled to enable the fourth end (D) to be communicated with the third end (C) and enable the first end (A) to be communicated with the second end (B) so as to lead the exhaust gas of the compressor out to the condenser through the first four-way valve (5) and the second four-way valve (6) and lead the outlet gas of the evaporator out to the suction port of the compressor through the second four-way valve (6) and the first four-way valve (5);
when the air conditioning system is stopped, the first four-way valve (5) can be controlled to enable the fourth end (D) to be communicated with the first end (A), and enable the second end (B) to be communicated with the third end (C) so as to enable the exhaust air and the suction air of the compressor to be communicated and close the suction air and the exhaust air.
4. The air conditioning system of claim 3, wherein:
further comprising a gas-liquid separator (7), said gas-liquid separator (7) being arranged between said second end (B) of said first four-way valve (5) and said seventh end (G) of said second four-way valve (6).
5. The air conditioning system according to any one of claims 1 to 4, characterized in that:
the throttling device (4) is connected to a pipeline between the condenser (3) and the evaporator (2).
6. The air conditioning system of claim 5, wherein:
the throttling device (4) is an electronic expansion valve.
7. The air conditioning system according to any one of claims 1 to 6, characterized in that:
the compressor (1) is a horizontal compressor.
8. A control method of an air conditioning system is characterized in that:
using the air conditioning system of any of claims 1-7, the first four-way valve is controlled to control refrigerant not to migrate into the compressor when the air conditioning system is off.
9. The control method according to claim 8, characterized in that:
when the first four-way valve includes a first end (a), a fourth end (D), a second end (B), and a third end (C):
when the air conditioning system is closed, controlling the first four-way valve to enable the fourth end (D) to be communicated with the first end (A) and simultaneously enable the second end (B) to be communicated with the third end (C);
when the air conditioning system is turned on, controlling the first four-way valve to enable the fourth end (D) and the third end (C) to be communicated, and simultaneously enabling the first end (A) and the second end (B) to be communicated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910951077.XA CN110595095B (en) | 2019-10-08 | 2019-10-08 | Air conditioning system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910951077.XA CN110595095B (en) | 2019-10-08 | 2019-10-08 | Air conditioning system and control method |
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| JPS5993156A (en) * | 1982-11-18 | 1984-05-29 | シャープ株式会社 | Heat pump type refrigeration cycle |
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| CN110595095B (en) | 2023-08-01 |
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